display: Fix support for MDP 4.1

 * MDP 4.1 still does not support the borderfill pipe, baselayer logic
   should not be used.

Change-Id: I587bdff4a03ced141e43819eea70cec1aedaeb7b

Conflicts:
	liboverlay/overlay.cpp
display-caf: Fixed derp from earlier merge - was affecting c2d2 libs

Change-Id: I7da6bb4a9572c2176efb610d08d1e23c7a8ac03f